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progressive pigmentary dermatosis

n.
  1. A chronic skin disorder resulting from hemorrhages into the skin, chiefly on the legs of young men, and characterized by purple patches that spread and turn brown.Schamberg's disease
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.